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Q. How many revolutions per minute would a 21 -diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point?

Q. A potential difference of 5.0×10-2 is developed across a 10-cm-long wire as it moves through a magnetic field at 5.0 . The magnetic field is perpendicular to the axis of the wire. what is the strength of the magnetic field.

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